TrichoLAB snApp vs GRAPPA App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TrichoLAB snApp
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TrichoLAB provides dermatologists with statistical analysis of trichoscopy images to support the diagnosis of hair and scalp disorders. TrichoLAB snApp enables doctors to capture trichoscopy images using any attached dermoscope.
GRAPPA App
This medical application aids in the assessment of patients with psoriatic arthritis and psoriasis. It provides tools to calculate disease severity scores and includes patient-completed questionnaires in multiple languages. Access to GRAPPA resources is also available.
- Psoriatic arthritis and psoriasis assessment
- Disease severity calculators (MDA, PASI, BSA)
- Patient-completed questionnaires (PsAID, PEST, HAQ)
- Multilingual questionnaire support
- Access to GRAPPA resources
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This app from GRAPPA (Group for Research and Assessment of Psoriasis and Psoriatic Arthritis) is designed to support the assessment of patients with psoriatic arthritis and psoriasis. It allows users to calculate a patient’s MDA and assess skin disease (using either PASI or BSA) through specially designed calculators. The app also includes PsAID, PEST and HAQ questionnaires which can be completed directly by patients in a range of languages and a selection of slides from the GRAPPA resources. Visit http://www.grappanetwork.org/ to find out more about GRAPPA.
Screenshots
Verdict
The clearest difference is in-app purchases: GRAPPA App at none against TrichoLAB snApp's 1. GRAPPA App also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.0). TrichoLAB snApp's advantage is update cadence (every 6 weeks vs every 3 months). On price and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. TrichoLAB snApp sells 1 one-off in-app purchase. GRAPPA App asks for nothing beyond the download.
TrichoLAB snApp ships an update every 6 weeks, GRAPPA App every 3 months. The most recent releases landed on October 29, 2026 and October 8, 2026 respectively.
| Parameter | TrichoLAB snApp | GRAPPA App |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 weeks — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 105 MB | 64 MB |
| Age rating | 4+ | 17+ |
| Developer | TrichoLAB sp. z o.o. | Group for Research and Assessment of Psoriasis and Psoriatic Arthritis |
In-app purchases
TrichoLAB snApp
- Credit$44.99
GRAPPA App
No in-app purchases
